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Engineered Conveyor & Packaging Systems from Ensalco
Engineered Conveyor & Packaging Systems from Ensalco Engineered Conveyor & Packaging Systems from Ensalco
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YOU ARE HERE: Rollers, Bearings, Pulleys & Wheels


Rollers
We offer a large variety of Rollers and Bearings with expedient Deliveries.
We have included the following General Information for your use.
Please feel free to Contact Us if we can assist you with your requirements.

Roller Description

A roller is an assembly of three major components: axle, tube and bearings. The length of a roller is defined in terms of the "between frame width" or "BF". This BF dimension allows 1/16 in. clearance between the extension on the bearings and the side frame. Frame thickness is also important information to insure proper assembly.

Roller Components

Axle
Most conveyor rollers have hexagonal axles to avoid rotation of the axles in the frames and to prevent the inner race from rotating on the axle. Round axles are also available. Larger sizes are kept from rotating by use of a keeper bar. Bearings used on these larger axles usually have set screws or eccentric locking collars to prevent inner races from rotating on the axle. Hex axles from 1/4 in. through 1 5/8 in. and round axles from 1/4 in. through 3 7/16 in. diameter are available.

Tube
Tubes are specified by outside diameter (O.D.) and wall thickness. Diameters from 1 in. through 8 in. are available. Wall thicknesses are expressed as either a gauge or a decimal dimension.

Bearings
In most cases, each roller will be listed with various bearing options. The selection may include bearings that are plain, sealed or shielded. There may also be non-precision, precision or journal bearing from which you must select. Select the bearing best suited for your needs.

Axle Construction

Pin or Ring Retained Axle
This axle has a hole drilled in each end of the axle to accommodate cotter pins or hog rings. Axles can also be drilled for pressure lubrication of bearings. Pin retained axles are offered in hex sizes of 1/4 in. through 1 1/2 in. and in round sizes of 5/16 in. through 3 7/16 in.

Non-Lubrication

Axle Drilled for Lubrication


Spring Retained Axle
This axle has two upsets or "dimples". When assembled into a roller, the axle is held in place by dimples between bearings. A spring retained roller is assembled into a frame by first inserting one end of the axle into the frame. The free end of the axle is then depressed and dropped into the other side frame. Removing the roller is equally as simple. Spring retained axles are available in hex sizes of 5/16 in. through 11/16 in. and a round axles size of 1/4 in.

Keeper Bar Retained Axle
This axle has a hole and machined flat on one end. The keeper bar is welded to the frame and rests against the flat surface of the axle, preventing it from rotating. The hole is for a cotter pin which holds the axle in the frame. Keeper bar retained axles are used only on round shafts 1 in. in diameter and larger.

Roller Construction

Counter Bored
This type of roller has a tube which is counter bored to the correct inside diameter for the bearing to be press fit into place.

Crimped
This type of roller has a tube which is crimped down over the bearing to hold it in place. Bearings installed in this manner are non-replaceable.

With Adapter
This type of roller uses a combination of a bearing and an adapter. The bearing is first press fit into the adapter and the adpater is then press fit into the tube.

Other Options

Rollers with Flanges
Flanges can be welded to the tube to guide the product. Flange location and quantity per tube must be specified.

Rollers with Sprockets
Type A plate sprockets are welded to rollers for use in Chain Driven Live Roller conveyors. Single or multiple sprockets per roller are available. Location of sprockets, chain size and number of teeth must be specified. Hardened tooth sprockets are also available. Below are the standard sprockets for specified roller diameters. These sprockets may also be purchased individually.

STANDARD SPROCKETS
Roller
Diameter
Sprocket
Size
Roller
Diameter
Sprocket
Size
Roller
Diameter
Sprocket
Size
1.9 in. 40A18
50A15
60A13
2 9/16 in. 40A22
50A18
60A15
80A13
4 in. 60A22
80A17
100A14
2 1/2 in. 40A22
50A17
60A15
3 1/2 in. 60A22
80A16
100A13
5 in. 80A20
100A17


Rollers with Grooves
Grooves can be rolled into the tube to accommodate 3/16 in. dia. urethane drive belts such as those used on Line Shaft Conveyors. Location of grooves must be specified. Standard roller diameters include 1 3/8 in., 1.9 in. and 2 1/2 in. Other sizes are available.

GROOVED ROLLERS
Roller Size Hex Size
1 3/8 in. O.D. x 18 Ga.
1 3/8 in. O.D. x 16 Ga.
1.9 in. O.D. x 16 Ga.
1.9 in. O.D. x .145 in. Wall
2 1/2 in. O.D. x 11 Ga.
5/16 in. Hex
5/16 in. Hex
7/16 in. Hex
7/16 in. Hex
11/16 in. Hex


Tapered Rollers
Tapered rollers are available in several sizes.

Rollers with Shot Guards
Tapered rollers are available on select rollers and help protect the bearing against contamination.

Rollers that are Hardened
All heavy-walled rollers are available with a hardened tube surface. Case hardened depth and Rockwell hardness must be specified.

Rollers with Special Coverings
Rollers are available with molded-on urethane or with slide-on sleeves. PVC covers are also available. Material type, durometer and thickness must be specified.

Rollers with Lagging
Rollers are available with lagging. Types of lagging available for rollers include:
  • Resilient rubber with adhesive back - 2 in. wide available in a 60 ft. roll.
  • Sand paper with adhesive back - 2 in. wide available in a 60 ft. roll.
  • Rough top belting (to be glued and riveted) - 1 in. wide or 2 in. wide available in a 50 ft. roll.


Roller Capacities

Roller capacity refers to the maximum load a single roller can support. Key factors in establishing a rollers capacity are as follows:
  • Bearing capacity
  • Bearing offest (dimension from side frame to centerline of balls)
  • Axle deflection
  • Tube deflection
Capacities are based on tube deflection of no more than .21% of BF and axle angular deflection of no more than 1 degree at the bearings. Angular deflection of the axle at the bearings is limited to .75 degrees for cylindrical semi-precision and precision bearings.

Roller Selection for a Given Load

Because the conveying surface of products is not perfectly flat, use only 2/3 of the rollers under the product when calculating the required roll capacity.

Common sense tells you that it is not practical to use a 1 3/8 in. diameter roll on 1 1/2 in. centers for a 6000 lb. product (12 in. wide x 120 in. long), so in addition to the rule above, use the following guidelines:

Roll Diameter & Axle Max. Product Weight
1 in. O.D. -5/16 in. hex
1 3/8 in. O.D. - 5/16 in. hex
1.9 in. O.D. - 7/16 in. hex
2 1/2 in. O.D. - 11/16 in. hex
3 1/2 in. O.D. - 1 1/16 in. hex
3 1/2in. O.D. - 1 7/16 in. O.D.
4 in. O.D. - 1 7/16 in. O.D.
5 in. O.D. - 1 11/16 in. O.D.
300 lbs
600 lbs
1500 lbs
3500 lbs
6000 lbs
10,000 lbs
15,000 lbs
25,000 lbs

The above guidelines assume "0" shock load and are not applicable for 3 or more lanes.

QUICK QUOTE
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